Moved the buttons to the header. All other buttons below the message view
go away, so I just hid the old buttons.
Also now we stop trying to hide these buttons when entering contextual mode,
which fixes bug 3044284: Message view buttons get disabled when closing
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Change-Id: Ib178c6221dfab02832a10d0c0441044e4969fb70
Create a custom view containing the bottons below MVF
(delete, move, reply, etc) and let MVF own this.
These buttons used to be owned by the XL activity itself, because
the UI for these commands will most likely be totally different
from the tablet UI, so the fragment having them looked wrong.
However, this made it harder to make changes suggested by the latest
mock, such as "put reply/forward in the message header".
I think the buttons are semantically part of the message view anyway,
so the fragment owning UI for these commands is probably the way to go.
(And let's worry about the phone UI later.)
Reason for the use of a custom view is that it will make it easier
to make non-trivial UI changes, e.g. "combine reply, reply-all and
forward and make it dropdown."
Also removed obsolete TODOs from MessageListXL.
Change-Id: Ibf93f4c70fe07bdbbe33d2adb6bbd2b96812830d